Persistent bad breath may be a sign of periodontal disease, an a ce ed tooth, chronic sinusitis, postnasal drip, chronic bronchitis, certain kinds of oesophageal problems, and other health conditio .

• 持久的口腔异味可能是某种疾病的征兆，如牙龈病、牙床脓肿、慢性鼻窦炎、后鼻漏、慢性支气管炎或某些食道疾病及其他健康问题。